Ethylene diamine tetra acetic acid

The Lo-Cat process can be used to sweeten or convert H2S to sulfur. It removes H2S only and will not remove CO2, COS, CS2, or mercaptans. Iron is held in dilute solution (high circulation rates) by the common chelating agent EDTA (ethylene diamine tetra acetic acid). The iron oxidizes the H2S to sulfur. The solution is circulated batchwise to an oxidizer for regeneration. 

Higher phytoextraction coefficients indicate higher metal uptake. The effectiveness of phytoextraction can be limited by the sorption of metals to soil particles and the low solubility of the metals however, metals can be solubilized through the addition of acids or chelating agents and so allow uptake of the contaminant by the plant. Ethylene diamine tetra-acetic acid (EDTA), citric acid, and ammonium nitrate have been reported to help in the solubilization of lead, uranium, and cesium... 

Buffer and chemicals pH 7.8 phosphate buffer (16.29g Na2HP04-2H20, 1.17g NaH2P04H20, 1000 ml distilled water), Ethylene Diamine Tetra Acetic Acid (EDTA), Methionine (Met), Polyvinylpyrrolidone (PVP), Triton X-100, Phenylmethylsulphonylfluoride (PMSF), Riboflavin, Nitro Blue Tetrazolium (NBT). 

EDTA ethylene-diamine-tetra-acetic-acid (complexing agent)... 

Complexes with organic compounds have been reported. Solubility studies with tributyl phosphate (TBP) indicate the formation of a complex PoC14-2TBP (IS). Weighable amounts of polonium tetrachloride in dilute hydrochloric acid can be titrated to a colorless end point with ethylene-diamine tetra-acetic acid (EDTA) the results suggest a complex with two molecules of EDTA, but solubility studies favor a 1 1 complex. The EDTA complex is soluble in alkali and is more stable in alkaline than in acid media, but the ligand is rapidly destroyed by the radiation and solvent radiolysis products 12). However, EDTA can apparently be used to complex trace polonium in the separation of radium D-E-F mixtures (129). 

When the metals exist in the complexed form, it is necessary to break up the complexes and transform the metals to "free" form amenable to chemical precipitation. Metal complexes consist of a central metal ion surrounded by a group of other organic or inorganic ions or molecules. Examples of complexing molecules are ammonia, citrates, and ethylene diamine tetra acetic acid (EDTA). 

AMS = accelerated mass spectroscopy EDTA = ethylene diamine tetra acetic acid GFAAS = graphite furnace atomic absorption spectrometry ICP-AES = inductively coupled plasma - atomic emission spectroscopy NAA = neutron activation analysis ETAAS = electrothermal atomic absorption spectrometry SEC/ICP-MS = size-exclusion chromatography/ICP-AES/mass spectrometry HLPC/ICP-AES = high-performance liquid chromatography/ICP-AES LAMMA = laser ablation microprobe mass analysis NA = not applicable ppq = parts per quadrillion... 

From studies carried out at the Directorate of Fisheries Research at Lowestoft (DFR) four types of complex have been chosen to illustrate the range of complex radiocobalt species that might be encountered in environmental waters. They are either species of known importance in the environment, such as cyanocobalamin and complexes with humic substances, or those generated specifically in the nuclear industry (e.g. complexes with ethylene diamine tetra-acetic acid (EDTA) or picolinic acid) and which are able to persist for significant periods following discharge to the aqueous environment. 

F6. Foreman, H., and Trujillo, T. T., The metabolism of C14 labeled ethylene-diamine tetra-acetic acid in human beings. J. Lab. Clin. Med. 43, 566-571 (1954). 

Spencer, H., Vankinscott, V., Lewin, I., and Lasslo, D., Removal of calcium in man by ethylene diamine tetra-acetic acid Metabolic study. /. Clin. Invest. 31, 1023-1027 (1952). 

The effect of additives in altering the catalyst environment has been studied by Wright and Weller (6). Chelation is known to alter the oxidation-reduction properties of ions and therefore could be expected to alter the activation of hydrogen. Ethylene diamine and ethylene diamine tetra-acetic acid inhibit both the rate and extent of reduction of quinone and cupric acetate monohydrate in quinoline solution at 100°. The production of metallic copper is related to the presence of organic material. 

Inulin can be modified to compounds that display good heavy metal complexing properties similar to ethylene diamine tetra-acetic acid (EDTA) but with better biodegradation properties (Bogaert et al., 1998). Inulin is first oxidized using sodium periodate to the dialdehyde, and then reduced to a polyol using Pt/C and hydrogen. The polyol can then be modified with carbon disulfide to form xanthate or with S03-pyridine to obtain an inulin sulfate. Alternatively, the dialdehyde can be animated with diaminoethane and sodium cyanoborohydride and the product reacted with monochloroacetic acid sodium salt to form carboxymethylamino inulin. Each of these compounds can be used to precipitate heavy metals. 

Specific extractants and sequential fractionation are also widely used procedures to estimate metal or nutrient availability to plants (see, e.g., Houba et al. 1996). Several extractants can be considered, like diethylene triamine penta acetate (DTPA), ethylene diamine tetra acetic acid (EDTA), acetic acid, HN03, HC1, or other... 

EDTA Ethylene diamine tetra acetic acid. 

These chiral viologens were applied to the reduction of metmyoglobin, too [72]. In this reaction, the one-electron reduced viologen radical cations were photochemically produced by tris(2,2,-bipyridme)ruthenium(II) in the presence of disodium salt of ethylene diamine tetra acetic acid (Na2H2edta), and the cation radical reacts with metmyoglobin to reduce it. The (S,S) isomer more rapidly reacts with metmyoglobin than the (R,R) isomer. The reaction rate is analyzed with Michaelis-Menten mechanism, as shown in Scheme 29. 

Ethylene Diamine Tetra Acetic Acid Salts... 

Inhib. abbrev. DTT = dithioghreitol E64D = epoxysuccinyl-L-leucyl-amido-3-methyl-butane ethyl ester EDTA = ethylene-diamine-tetra-acetic acid EGTA = ethylen-glycol-tetra-acetic acid LHVS = morpholinurea-leucine-homophenyl-alanine-vinylsulfone-phenyl NEM = N-ethyl-maleimide PAI = plasminogen activator inhib. PMSF = phenil-methyl-sulfonil fluoride SBTl = soybean trypsin inhib. TIMP = tissue inhib. of metalloproteinases TPCK = tosyl-L-phenyl-alanyl-chloro-methane Al.so termed stephins. 

A 34-year-old man developed swelhng and redness of the face after receiving lidocaine as Lignospan for dental treatment. Patch testing showed allergic contact dermatitis due to the preservative disodium ethylene-diamine tetra-acetic acid (EDTA). 

Solution of ethylene diamine tetra acetic acid (EDTA) (Sigma-Aldrich, Athens, Greece). 10 mM solution is prepared in d.d. H O, and used the same day. 

Ethylene diamine tetra-acetic acid (EDTA) Polyethylene glycol ethers Carbox5unethyl cellulose salts... 

The second method is by ethylene diamine tetra acetic acid (EDTA) titration, in which an indicator, Eriochrome Black T is added to the water sample, which develops a red color due to the presence of ( k. When EDTA titer is added, Ca is complexed and yields an end point at which the color changes to blue. To ensure a sharp end point, a small amount of magnesium salt of EDTA is added. The titration is performed at room temperature and at a pH of 10. 

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